\(समुच्चय (S_1={x:x\in \mathbb{N},,x\) is a factor of 45 and x+2 is prime}) का सूची रूप क्या है?
\(What is the roster form of (S_1={x:x\in \mathbb{N},,x\) is a factor of 45 and x+2 is prime})?
Correct answer and explanation
C. \(S_1={1,3}\)
Concept
(45) के भाजक (1,3,5,9,15,45) हैं। / Factors of (45) are (1,3,5,9,15,45).
Why this answer is correct
(x+2) जांचें: (3,5,7,11,17,47) मिलते हैं, और ये सभी अभाज्य हैं। / Adding (2) gives (3,5,7,11,17,47), all of which are prime.
Exam Tip
इसलिए सभी भाजक लेने चाहिए, न कि केवल छोटे मान। / Therefore all listed factors satisfy the condition, so the full set of factors is needed.
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